Elastic Contact and Friction Between Sliders and Circumferentially Textured Disks—Part III: Experiments

1998 ◽  
Vol 120 (4) ◽  
pp. 800-807 ◽  
Author(s):  
K. Tanaka ◽  
J. Ishikawa ◽  
A. Shimamoto
Keyword(s):  
Elastic Contact ◽  
High Humidity ◽  
Two Dimensional ◽  
Hertz Contact ◽  
Real Contact ◽  
Flat Edge ◽  
Contact Situation ◽  
Frictional Coefficients ◽  
Hertz Contact Model ◽  
Flat Contact

This three part paper presents the experiment and numerical analysis of the friction of a thin-film rigid disk with circumferential surface texture. In Part III, we examine the friction of a disk on the unworn virgin and worn tracks at various relative humidities. The real contact areas and pressures on both tracks are estimated using the Hertz contact model of two-dimensional asperities in Part I and related to the frictional coefficients on the basis of the meniscus model in Part II. The analysis yields that the effect of meniscus is predominant in the flat contact situation, particularly on the worn track at high humidity, while the effect is negligible in the taper/flat edge contact situation on both the tracks even at high humidity.

Simulation of Rough, Elastic Contacts

1997 ◽  
Vol 64 (2) ◽  
pp. 361-368 ◽  
Author(s):  
J. J. Kalker ◽  
F. M. Dekking ◽  
E. A. H. Vollebregt
Keyword(s):  
Frictional Contact ◽  
Three Dimensional ◽  
Contact Problems ◽  
The Other ◽  
Elastic Contact ◽  
Two Dimensional ◽  
Real Contact ◽  
Terra Incognita ◽  
Other Hand ◽  
Quantitative Results

Frictionless rough contact problems have been studied in great detail by J. A. Greenwood and his co-workers. The only thing that actually seems missing is a simulated figure of the real contact between two rough bodies. Such a figure will be provided. Frictional rough elastic contact, on the other hand, seems to be terra incognita, and we intend to explore it. We will use two-dimensional rough bodies, because then we can simulate many asperities, and also because three-dimensional does not differ very much from two-dimensional in frictional contact, while finally the figures resulting from two-dimensional are clearer and more transparent as well as more realistic. On the other hand, two-dimensional calculations yield only qualitative results; for quantitative results one needs three-dimensional computations.

Plastic Ploughing of a Sinusoidal Asperity on a Rough Surface

2015 ◽  
Vol 82 (7) ◽  
Author(s):  
H. Song ◽  
R. J. Dikken ◽  
L. Nicola ◽  
E. Van der Giessen
Keyword(s):  
Friction Stress ◽  
Dislocation Dynamics ◽  
Two Dimensional ◽  
Unit Process ◽  
Contact Models ◽  
Self Similar ◽  
Dynamics Simulations ◽  
Micrometer Scale ◽  
Edge Dislocations ◽  
Flat Contact

Part of the friction between two rough surfaces is due to the interlocking between asperities on opposite surfaces. In order for the surfaces to slide relative to each other, these interlocking asperities have to deform plastically. Here, we study the unit process of plastic ploughing of a single micrometer-scale asperity by means of two-dimensional dislocation dynamics simulations. Plastic deformation is described through the generation, motion, and annihilation of edge dislocations inside the asperity as well as in the subsurface. We find that the force required to plough an asperity at different ploughing depths follows a Gaussian distribution. For self-similar asperities, the friction stress is found to increase with the inverse of size. Comparison of the friction stress is made with other two contact models to show that interlocking asperities that are larger than ∼2 μm are easier to shear off plastically than asperities with a flat contact.

scholarly journals A Static Friction Model for Unlubricated Contact of Random Rough Surfaces at Micro/Nano Scale

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 368
Author(s):  
Shengguang Zhu ◽  
Liyong Ni
Keyword(s):  
Rough Surfaces ◽  
Static Friction ◽  
Friction Model ◽  
Elastic Contact ◽  
Nano Scale ◽  
Random Rough Surfaces ◽  
Proposed Model ◽  
Dissipation Mechanism ◽  
Rigid Plane ◽  
Contact Situation

A novel static friction model for the unlubricated contact of random rough surfaces at micro/nano scale is presented. This model is based on the energy dissipation mechanism that states that changes in the potential of the surfaces in contact lead to friction. Furthermore, it employs the statistical theory of two nominally flat rough surfaces in contact, which assumes that the contact between the equivalent rough peaks and the rigid flat plane satisfies the condition of interfacial friction. Additionally, it proposes a statistical coefficient of positional correlation that represents the contact situation between the equivalent rough surface and the rigid plane. Finally, this model is compared with the static friction model established by Kogut and Etsion (KE model). The results of the proposed model agree well with those of the KE model in the fully elastic contact zone. For the calculation of dry static friction of rough surfaces in contact, previous models have mainly been based on classical contact mechanics; however, this model introduces the potential barrier theory and statistics to address this and provides a new way to calculate unlubricated friction for rough surfaces in contact.

Two-Dimensional Contact Analysis Using Trigonometric Polynomials: Some Early Verification Problems

2018 ◽  
Author(s):  
Gaurav Chauda ◽  
Daniel J. Segalman
Keyword(s):  
Half Plane ◽  
Frictional Contact ◽  
Contact Analysis ◽  
Trigonometric Polynomials ◽  
Elastic Contact ◽  
Two Dimensional ◽  
Contact Algorithm ◽  
Numerical Predictions ◽  
Interface Mechanics ◽  
Friction Models

A discretization strategy for elastic contact on a half plane has been devised to explore the significance of different friction models on joint-like interface mechanics. It is necessary to verify that discretization and accompanying contact algorithm on known solutions. An extensive comparison of numerical predictions of this model with corresponding 2-D elastic, frictional contact solutions from the literature is presented.

Strongly Anisotropic Rough Surfaces

1979 ◽  
Vol 101 (1) ◽  
pp. 15-20 ◽  
Author(s):  
A. W. Bush ◽  
R. D. Gibson ◽  
G. P. Keogh
Keyword(s):  
Random Process ◽  
Rough Surface ◽  
Contact Area ◽  
Process Model ◽  
Rough Surfaces ◽  
Plasticity Index ◽  
Real Contact Area ◽  
Elastic Contact ◽  
Elastic Plastic ◽  
Real Contact

The statistics of a strongly anisotropic rough surface are briefly described. The elastic contact of rough surfaces is treated by approximating the summits of a random process model by parabolic ellipsoids and applying the Hertzian solution for their deformation. Load and real contact area are derived as functions of the separation and for all separations the load is found to be approximately proportional to the contact area. The limits of elastic/plastic contact are discussed in terms of the plasticity index.

A finite element analysis of an elastic contact between a layered cylindrical hollow roller and flat contact

2017 ◽  
Vol 69 (1) ◽  
pp. 30-41 ◽  
Author(s):  
Mitul Thakorbhai Solanki ◽  
Dipak Vakharia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Research Work ◽  
Roller Bearing ◽  
Von Mises Stress ◽  
Elastic Contact ◽  
Element Analysis ◽  
Content Type ◽  
Contact Width ◽  
Flat Contact

Purpose The purpose of this paper is to present a finite element analysis (FEA) which shows the comparison between a layered cylindrical hollow roller bearing and hollow roller bearing. Design/methodology/approach In this work, FEA is carried out to solve the elastic contact between a layered cylindrical hollow roller and flat contact for different hollowness percentages ranging from 10 to 80 per cent. Graphical solution is developed to determine the optimum hollowness of a cylindrical roller bearing for which induced bending stress should be within endurance limit of the material. Findings Different parameters such as von Mises stress, contact pressure, contact width and deformation are shown here. Originality/value The value of this research work is the calculation of contact width and other parameters using FEA for layered cylindrical hollow roller bearing.

scholarly journals Cylinder-Flat Contact Mechanics with Surface Roughness

2020 ◽  
Vol 69 (1) ◽  
Author(s):  
A. Tiwari ◽  
B. N. J. Persson
Keyword(s):  
Surface Roughness ◽  
Contact Pressure ◽  
Dimensionless Parameter ◽  
Elastic Half Space ◽  
Root Mean Square Roughness ◽  
Mean Square ◽  
Hertz Contact ◽  
Random Surface ◽  
Roughness Amplitude ◽  
Flat Contact

AbstractWe study the nominal (ensemble averaged) contact pressure p(x) acting on a cylinder squeezed in contact with an elastic half space with random surface roughness. The contact pressure is Hertzian-like for $$\alpha < 0.01$$ α < 0.01 and Gaussian-like for $$\alpha > 10$$ α > 10 , where the dimensionless parameter $$\alpha = h_{\rm rms}/\delta $$ α = h rms / δ is the ratio between the root-mean-square roughness amplitude and the penetration for the smooth surfaces case (Hertz contact).

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